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Lower carbon to Hydrogen ratio of CNG makes it a cleaner fuel, due to this CNG is gaining popularity as an Internal Combustion (IC) engine fuel in transport sector. Hydrogen fuel for IC engines is also being considered as a future fuel due to its simple carbonless structure. But several obstacles have to overcome before commercialization of H2 as an IC engine fuel for transport sector. Hydrogen & CNG blends may be considered as an automotive fuel without any major modification in the existing SI engines. The Present work is undertaken to demonstrate the viability of HCNG as an automotive fuel. A passenger car fitted with a 4 cylinder, 1.3 liter, SI engine has been used in the present investigation. A sequential gas injection system has been developed to avoid the risk of back firing. The effect of gas pressure and gas temperature on the duration gas injection has been considered in the control strategy.